Flemings Right-Hand Rule: Statement, Explanation, Applications

To illustrate why, consider that many types of electric motors can also be used as electric generators. A vehicle powered by such a motor can be accelerated up to high speed by connecting the motor to a fully charged battery. If the motor is then disconnected from the fully charged battery, and connected instead to a completely flat battery, the vehicle will decelerate. The motor will act as a generator and convert the vehicle’s kinetic energy back to electrical energy, which is then stored in the battery. Since neither the direction of motion nor the direction of the magnetic field (inside the motor/generator) has changed, the direction of the electric current in the motor/generator has reversed. When a conductor such as a wire attached to a circuit moves through a magnetic field, an electric current is induced in the wire due to Faraday’s law of induction.

Applying Fleming’s left-hand rule, the force experienced by the proton will be along the north. The index finger of the left hand in such a way that they make an angle of 90 degrees and the conductor placed in the magnetic field experiences Magnetic force. The devices which use current-carrying conductors and magnetic fields include electric motors, microphones, loudspeakers, and current detecting measuring instruments, such as ammeters and galvanometers, etc.

To resolve this issue, we use the commutator and a carbon brush for a complete rotation of the loop to avoid distortion in the wire, as we can see in Fig. Force in the lower orange wire is outwards, and that of the upper orange wire inward wire inwards. We hope this detailed article on Fleming’s Right-Hand Rule helps you in your preparation. If you get stuck do let us know in the comments section below and we will get back to you at the earliest.

It’s because forces acting in opposite directions make the loop rotate. But one thing we can see in orange wire, the current is flowing in the right direction while magnetic field B is in the left direction. The current and magnetic field is in the opposite direction.

Additionally, in an orange wire, the current is flowing in the right direction while magnetic field B is in the left direction. The flow of current and the magnetic field are in the opposite direction. Fleming’s Right hand Rule states that if we stretch the thumb, middle finger, and an index finger in such a way that they are mutually perpendicular to each other. A right hand is stretched such that the thumb, middle finger, and index finger make an angle of 90 degrees to each other. It can also be used to determine the direction of current in a generator’s windings.

Fleming’s Left-Hand Rule: Definition & Application

In a standard DC electric motor, the electromagnetic field interacts with the magnetic field generated by the permanent magnets, and due to this interaction, a physical force is generated. If the current i flowing in the straight conducting wire as shown in the figure decreases, find out the direction of induced current in the metallic square loop placed near it. 5, we notice that though forces are in opposite directions, their direction doesn’t change.

The thumb points the direction of the motion of the conductor relative to the magnetic field. We are given that a proton is moving towards the east, and a magnetic field is acting on it in the downward direction. The orange wires would try to distort the loop, as the loop is of very high strength and the spinning of the loop won’t be there at this moment.

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The important part, though, is that we calculate the magnetic field using the same arbitrary right hand rule. Interestingly, when used in pairs like this, the arbitrary nature of the right hand rule cancels out. Some mnemonics are discussed below.Father, Mother, and Children, here bold letter F stand for force , the bold letter M stands for magnetic field , and bold letter C stands for direction of induced current .

By convention, it’s the direction from the North to the South magnetic pole. Frequently Asked Questions – FAQsState Fleming’s right-hand rule. No, it’s because the source of the magnetic field is not a magnetic charge. However, in the case of the electric field, the source of the electric field is an electric charge.

Fleming gave a simple rule that helps us to determine the direction of force acting on a current-carrying wire placed in a magnetic field. This rule is termed as Fleming’s left-hand rule and it can be stated as follows. The direction of the induced magnetic field can be remembered by Maxwell’s corkscrew rule. That is, if the conventional current is flowing away from the viewer, the magnetic field runs clockwise round the conductor, in the same direction that a corkscrew would have to turn in order to move away from the viewer.

Why does Fleming’s right hand rule work?

In 3D such creature has three independent components and can be assigned an almost vector nature. Fleming’s Right-hand rule is applied to the conductor moving in a magnetic field. The Right-hand rule uses the Thumb, the index finger, and the middle finger of the left hand. It is used to find the direction of the magnetic force acting on the current carrying conductor placed in a uniform magnetic field.

As per Faraday’s law on electromagnetic induction, whenever any conductor is moved inside a magnetic field, there will be a generation of current in it called an induced current. In the event that this conductor gets forcefully moved inside the magnetic field, there will be a relation between the direction of applied force, magnetic field and the induced current. When any current-carrying conductor is placed in a uniform magnetic field, a force is exerted on the conductor.

The main application of Fleming’s right-hand rule is to determine the direction of induced current in the conductor placed in the magnetic field. Hold the forefinger, the middle finger and the thumb of your left hand at right angles to each other. Adjust your hand in such a way that the forefinger points in the direction of the magnetic field and the middle finger points in the direction of the current, then the direction in which the thumb points, gives the direction of force acting on the system. This relationship between these directions is provided by the Fleming right-hand rule. If a current carrying conductor placed in a magnetic field, it experiences a force due to the magnetic field.

Fleming’s left hand rule

To picture this, consider a current-carrying conductor placed in-between a horseshoe magnet. This magnet produces some magnetic field in the direction indicated by the forefinger or Index finger. The current passing through the conductor will be in the direction of the middle finger. This conductor experiences a force that is indicated in the direction of the thumb. If the poles of this magnet were reversed, the applied force would also be in the reverse direction.

Also the orange wire is not parallel, and it makes some angle with the magnetic field lines, which is why the loop rotates. It’s vital to note that these rules don’t define magnitude; rather, they demonstrate the direction of the three parameters when the other two parameters’ directions are known. Electric motors are predominantly affected by Fleming’s Left-Hand Rule, while electric generators are primarily affected by Fleming’s Right-Hand Rule. The current in the external circuit now flows from \(B1\) to \(B2.\) Thus after every half rotation, the polarity of the current in the respective arms changes. Such a current, which changes direction after equal intervals of time, is called an alternating current. The magnetic field $\textbf$ is not a vector, instead it is an anti-symmetric tensor.

On the other flemings right hand rule defination, if a conductor moved in a magnetic field, an emf gets induced across the conductor (Faraday’s law of electromagnetic induction). In this article, we are interested in determining the direction of induced current in the loop, developed when a conductor attached to the loop moves in a magnetic field. So let’s get started… with the article i.e Fleming’s right-hand rule . As time passes, the magnetic flux linked with the loop increases.

Fleming’s Left Hand Rule and Fleming’s Right Hand Rule

Fleming’s left hand states that “When you keep the thumb, index finger and middle finger of the left hand at right angles (90°) to each other. If the thumb shows the applied force or motion, the first shows the lines of flux , then the second finger shows the direction of current“. From the motion of the conductor in a magnetic field, we know that when a conductor moves in a magnetic field an EMF is induced across the ends of the conductor called motional EMF.

Fleming’s left hand rule and right-hand rule were given by British physicist John Ambrose Fleming in the late \(\) century. According to Faraday’s law of electromagnetic induction, When a conductor such as a wire attached to a circuit moves through a magnetic field, an electric current is induced in the wire. Fleming’s right-hand rule gives direction in which the current flows.

Here, in the above diagram of the electric motor, we notice that each side of the loop behaves as a current-carrying conductor. You can find its application in the working of electric motors. You can follow the same methods mentioned above for Fleming’s left hand rule. In this case, you just have to consider your right hand instead of the left hand.

Michael Faraday found that a voltage is generated by moving a conductor in a magnetic field . This wire or conductor must be part of an electrical circuit. In the absence of a circuit, the positive charge and negative charge will accumulate at the two ends of the conductor. If the ends of this conductor are attached to, e.g., a bulb, the circuit is complete, and an electric current starts flowing in the circuit. The direction of the current can be found in Fleming’s Right-hand Rule magnetic field. According to the Faraday’s law of electromagnetic induction, when a conductor moves in a magnetic field, an EMF is induced in it.

• By convention, it’s the direction from the North to the South magnetic pole.
• The direction of this applied force can be found through Fleming’s left hand rule.
• However, in the case of the electric field, the source of the electric field is an electric charge.
• If the conductor is provided a closed path, then the induced emf causes a current to flow.
• It contains well-written, well-thought-out, and well-explained science articles, especially on physics, chemistry, mathematics, and biology.

Fleming’s left-hand rule tells us that if we stretch our thumb, middle finger and the index finger of our left hand in mutually perpendicular directions to each other, we can see the relation between directions of force , current , and magnetic field . Thus, the conductor placed in the magnetic field experiences a magnetic force in a direction orthogonal both to that field and the direction of the current flow. Scroll down to understand this important concept in detail. The thumb, index finger and middle finger of right hand are stretched out in mutually perpendicular directions (as shown in Figure 4.8).

Fleming’s right-hand rule gives which direction the current flows. So whenever a conductor is forcefully moved in an electromagnetic field, an emf gets induced across the conductor. If the conductor is provided with a closed path, the induced emf causes a current flow. Fleming’s left-hand rule is used for electric motors, while Fleming’s right-hand rule is used for electric generators. In other words, Fleming’s left hand rule should be used if one were to create motion, while Fleming’s right hand rule should be used if one were to create electricity.

When a conductor such as a wire attached to a circuit moves through an external magnetic field, an electric current is induced in the wire due to Faraday’s law of induction. The right-hand rule is used to find the direction of current induced within the coils of an electric generator. Fleming’s right hand rule is applicable for electrical generators. As per Faraday’s law of electromagnetic induction, whenever a conductor is forcefully moved in an electromagnetic field, an emf gets induced across the conductor. If the conductor is provided a closed path, then the induced emf causes a current to flow. Whenever a current carrying conductor is placed in a magnetic field, the conductor experiences a force which is perpendicular to both the magnetic field and the direction of current.

About Us Learn more about Stack Overflow the company, and our products. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Hence, our issue was resolved by using a commutator for the smooth rotation of the motor. Now what we can do is use the commutator and a carbon brush for a complete rotation of the loop without getting the wire distorted.